U.S. President-elect Donald Trump tweeted on Sunday that besides winning the Electoral College "in a landslide" in the Nov. 8 election: "I won the popular vote if you deduct the millions of people who voted illegally."

The allegation, made without evidence, comes as Democratic rival Hillary Clinton's lead in the popular vote over Trump has surpassed 2 million votes and is expected to grow to more than 2.5 million as ballots in populous states such as California continue to be tallied.

Clinton's legal team said on Saturday it had agreed to participate in a recount of Wisconsin votes after the state's election board approved the effort requested by Green Party candidate Jill Stein, which Trump has called "ridiculous."

"In addition to winning the Electoral College in a landslide, I won the popular vote if you deduct the millions of people who voted illegally," Trump tweeted as reporters waited for him to leave his Mar-a-Lago golf resort in Florida to fly back to his residence in New York City.

Here's what he said on Twitter:

Hillary Clinton conceded the election when she called me just prior to the victory speech and after the results were in. Nothing will change

[excerpt] How many non-citizen votes were likely cast in 2008? Taking the most conservative estimate (those who both said they voted and cast a veriﬁed vote) yields a conﬁdence interval based on sampling error between 0.2% and 2.8% for the portion of non-citizens participating in elections.

Taking the least conservative measure e at least one indicator showed that the respondent voted yields an estimate that between 7.9% and 14.7% percent of non-citizens voted in 2008.

Since the adult noncitizen population of the United States was roughly 19.4 million (CPS, 2011), the number of non-citizen voters (including both uncertainty based on normally distributed sampling error, and the various combinations of veriﬁed and reported voting) could range from just over 38,000 at the very minimum to nearly 2.8 million at the maximum

Not having voter ID laws means anyone who wants to can scam their way into the voting booth.